Form cylinder for intaglio printing



Au ie, 1930. A. EGLI 1,774,256

FORM CYLINDER FOR INTAGLIO PRINTING Filed July 20, 1928 Patented Aug. 26, 1930 UNITED STATES PATENT OFFICE ARNOLD EGLI, OF HAMBURG, GERMANY FORM CYLINDER FOR ,INTAGLIO PRINTING Application filed July 20. 1928, Serial No. 294,273, and in Germany May 3, 1927.

At the beginning of copper intaglio print shell at a minimum. A disc (Z having screws ing copper tubes were employed as form 1; extending therethrough and engaging the. cylinders.--the said tlllics being pressed on to. cylinder (1. serves to press the shell on to the strong cast iron cylinders provided with steel cylinder; The noses f on the disc d serve to 5 axles. Today these cast iron cylinders are guidethe ribbed shell concentrically 011 to the.

provided with a galvanized copper covering. carrying cylinder when the shell is applied which has to be again coppei'ed over in the to the latter. These noses f fit into recesses copper bath when a number of etchings have g in the. carrying cylinder/i, so that the outerbeen taken off; The. copper covering and the most rib of the ribbed shell does not lose its 10 cast iron cylinder l'orm consequently an insupport. The dot and dash lines at the left separable unit. Such form cylinders are used of Fig. 2 indicate. the position of the outer essentially for the printing by roller. For shell before it is forced onto the carrying plate printing machines steel tubes having cylinder (1. A disc 71.. which. like the disc (l. walls of about 5 millimeters are coppercd and is provided with a ring-shaped projection at '15 mounted upon carrying cylinders,formed-as its rim extending toward the carrying cylexpansion cylinders. tirmly positioned at one inder,'is engaged by a nut 1'. to force the ribbed side of the printing machine. shell from oil' the carrying cylinder after These steel tube cylinders have an adremoval of the disc d. i vantage over the massive cast cylinders. in- I claim:

20 asmuch as they are light to handle and maybe 1. A form cylinder for intaglio printing carried and attached by one man. The cylcomprising. in combination. a conical carryinders have, however, the drawback that they ing cylinder and a closed tubular shell surare seldom exactly round.and that a steel tube rounding said cylinder and provided on its cylinder mounted firmly on the expansion interior face with ribs spaced longitudinally 25 cylinder is not always firm throughout. its thereof, said shell having a tapered bore entire surface. It often happens. as a result through said ribs, whereby said shell may be v of this. that such a cylinder moves during' f0rcefitted directly onto said cylinder with the printing. thus incurring great damage. the ribs in engagement with the latter.

The present invention consists in the pro- 2. The form cylinder as set forth in claim 30 vision of a form cylinder which has the ad- 1 wherein the. ribs are of circular form and vantages of the light steel tube cylinder, and extendtransversely of the axis of the carrying which at the same time is more stable than the cylinder. latter. and which lies more accurately upon 3. A form cylinder for intaglio printing the carrying cylinder so that it sits absolutely comprising. in combination. a conical carry- 35 lirnily. ing cylinder. a closed tubular shell sii iirti und- The invention is illustrated by way of exing said cylinder and provided on its interior ample in the accompanying drawing. whereface with ribs spaced longitudinally thereof. in Fig. 1 is a longitudinal section through an said shell having a tapered bore througlisaid assembled cylinder. and Fig. 2 shows an enribs. whereby said shell may be force-fitted 40 larged view of the left-hand end of the cyldirectly onto said cylinder with the ribs in inder. engagement with the latter. and means fo'r ()n the conical ortapered carryingcylinder forcing said ribbed shell upon and off said (I is mounted a ribbed shell I) with copper carrying cylinder.

covering c. This ribbed shell I) has a conical 4. A form cylinder for iutaglio printing or tapered bore corresponding to the conical comprising, in combination. a conical carrycarrying cylinder. The use of ribs on the ing cylinder. a closed tubular shellsurroimdshell 7) permits the bore to be made with a ing said cylinder and provided on its interior strong taper. as shown in the drawing. so face with ribs spaced longitudinally thereof. as to facilitate separation from the carrying said shell havng a tapered bore through said cylinder, while keeping the weight of such ribs, whereby said shell may be force-titted directly onto said cylinder with the ribs in engagement withth-e-'latter,-and means for forcing said ribbed shell upon and off said carrying cylinder, said means comprising 5 discs movably mounted on the shaft of the supporting cylinder and adapted to engage opposite ends of said shell, and threaded elements associated with said discs and with said carrying cylinder and operable to press the discs toward said cylinder.

5. A form cylinder for intaglio printing comprising, in combination, a conical carrying cylinder, :1 closed tubular shell surround- "ing said cylinder and providedon its interior face with ribs spaced longitudinally thereof, said shell having a tapered bore through said ribs, whereby said shell may be force-fitted directly onto said cylinder with the ribs in engagement with the latter, and means for forcing said ribbed shell upon and off said carrying cylinder, said means comprising discs movably mounted on the shaft of the supporting cylinder and provided with ringshaped projections adapted to engage opposite ends of said shell. threaded elements ass0- ciated with said discs and with said carrying cylinder and operable to press the discs toward said cylinder, and means for guiding .said shell parallel to the axis of the cylinder as said shell is forced onto or off the latter.

6. A form cylinder for intaglio printing comprising, in combination, a conical carrying cylinder. :1 closed tubular shell surrounding said cylinder and provided on its interior face with ribs spaced longitudinally thereof, said shell having a tapered bore through said ribs, whereby said shell may be force-fitted directly onto said cylinder with the ribs in engagement with the latter, 0 and means for forcing said ribbed shell upon and off said carrying cylinder, said means comprising discs movably mounted on the shaft of the supporting cylinder and adapted to engage opposite ends of said shell. threaded elements associated with said discs and with said carrying cylinder and operable to press the discs toward said cylinder, noses projecting from one of said discs toward said cylinder, the outer surfaces of said noses being concentric with the axis of the cylinder and arranged to engage at least one of said ribs to maintain said shell concentric with respect to said cylinder axis.

In testimony whereof I have hereunto set my hand.

ARNOLD EGLI. 

